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Electronic schematic - need help identifying components

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Razed

New Member
Attached is a copy of the board I need to build.
Is anyone able to tell me what I will need for this, and would be able to give me a brief guide on how to build it?
 

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KMoffett

Well-Known Member
That's not a timer board. That's a schematic of the components inside a 555 integrated circuit chip.

Ken
 

dr pepper

Well-Known Member
Most Helpful Member
The 555 is an 8 pin dil chip.
The module you linked us too is an interesting model of said chip, looks like 20 or 30x larger than a 555.
 

Razed

New Member
Thanks, there was some confusion between what I needed to build/repair. But I've got it sorted now.
 

Razed

New Member
If I need any further assistance I'll let you know. I thought I had to build said model of the chip, but I have a small 555 chip in an object that needs repair, and just needed to clarify that the schematic wasn't a totally different chip. Now I've researched the chip and can make the necessary repairs.
 

Grossel

Well-Known Member
You will certainly have some trouble finding a standalone transistor replacement for Q9.
 

Ylli

Active Member
Q19. You could probably use two transistors with the emitters and bases in parallel, separate collectors. But so much of this circuit depends on the matching of parts and the fact that they are on the same substrate make it *almost* impossible to reproduce it using the same circuit. Functionally, no problem, but not identical circuitry.
 

Grossel

Well-Known Member
Well - extra diodes in seies to each emitter should also work, but then adjustments to all affected* resistors had to be made.
 
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